The real test of honesty is whether you will overrule your partner's line call.
I played a match recently with a lady who tends to call lines while looking across them. Happens all the time with her. We were early in the first set, and she called a ball wide on the sideline when I was closer and looking down that line.
Nope, sorry. I think it caught, so I gave them the point after discussing it with her.
It would have been easy to say, "I'm going with my partner's call." But darn it, folks need to stop calling lines when they are not in good position to make the call. The only way to educate them is disagree and award the opponent the point.
-- Random Error Generator, Version 4.0
-- Master Moonballer